according to procedure, once you have created a vacuum in the system equivalent to 1.5v on the FTPS and that the valves are closed, the voltage is assumed to remain at 1.5V and up to 3.3V quickly when opening the vent valve. It does not seem logical to me. I think it is normal that the pressure rises when the gasoline is lockedwith vibrations.

The proof is this: When I create a vacuum for 1.5V, the voltage rises slowly, but exceeds the rated voltage of 3.3V. If the voltage increase was due to a leak, the voltage will stabilizes at 3.3V, but it'll reaching 5V now! The system pressurizes itself with engine running and valves closed! So how to make this test reliable?

Jason Bouchard
Technician
Garage J-C Lachance
Saint-Henri-de-Levis, Quebec, Canada